. . . . . . . . . "Papilio cresphontes" . . "Ptelea trifoliata" . . "Karen Yukich. 2016. Papilio cresphontes insect host plant Ptelea trifoliata. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/3863678> on 05 Apr 2018." . . . . "http://iNaturalist.org is a place where you can record what you see in nature, meet other nature lovers, and learn about the natural world." .